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BSI PD ISO/TS 13725:2021

BSI PD ISO/TS 13725:2021

$142.49

Hydraulic fluid power. Method for evaluating the buckling load of a hydraulic cylinder

Published By Publication Date Number of Pages
BSI 2021 30
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This document specifies a method for the evaluation of the buckling load which:

  1. takes into account a geometric model of the hydraulic cylinder, meaning it does not treat the hydraulic cylinder as an equivalent column,

  2. can be used for all types of cylinder mounting and rod end connection specified in Table 2,

  3. includes a factor of safety, k, to be set by the person performing the calculations and reported with the results of the calculations,

  4. takes into account possible off-axis loading,

  5. takes into account the weight of the hydraulic cylinder, meaning it does not neglect all transverse loads applied on the hydraulic cylinder,

  6. can be implemented as a simple computer program, and

  7. considers the cylinder fully extended.

The method specified is based on the elastic buckling theory and is applicable to single and double acting cylinders that conform to ISO 6020 (all parts) , ISO 6022 and ISO 10762 . If necessary, finite element analyses can be used to verify as well as to determine the buckling load.

The method is not developed for thin-walled cylinders, double-rods or plunger cylinders.

The method is not developed for internal (rod) buckling.

The friction of spherical bearings is not taken into account.

NOTE

This method is based mainly on original work by Fred Hoblit [ 2 ]. This method has been established in reference to the standard NFPA/T3.6.37 [ 1 ].

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Symbols and units
4.1 General
11 4.2 Additional notations
5 General principles
5.1 Purpose
5.2 Description
12 5.3 Dimensional layout of hydraulic cylinder
13 5.4 Common calculation of maximum stress in the rod (for all mounting types) σ max
5.4.1 General
14 5.4.2 Deflexion curve
5.4.3 Bending moment
5.4.4 Maximum value of the bending moment
5.4.5 Maximum stress of the piston rod
15 5.4.6 Mounting types of the cylinder tube and piston rod
16 6 Case of pin-mounted hydraulic cylinders
6.1 Model of the hydraulic cylinder and unknown values
6.2 Linear system
17 6.3 Critical buckling load
6.4 Greatest allowable compressive load
18 7 Case of hydraulic cylinders fixed at the beginning of the cylinder tube and pin mounted at the end of the piston rod
7.1 Critical buckling load
7.2 Linear system
19 8 Case of hydraulic cylinders pin mounted at the beginning of the cylinder tube and fixed at the end of the piston rod
8.1 Critical buckling load
8.2 Linear system
20 9 Case of hydraulic cylinders fixed at both ends
9.1 Critical buckling load
21 9.2 Linear system
22 10 Case of hydraulic cylinders fixed at the beginning of the cylinder tube and free at the end of the piston rod
10.1 Critical buckling load
23 10.2 Linear system
24 11 Case of hydraulic cylinders fixed at both ends with free movement allowed at the end of the piston rod
11.1 Critical buckling load
25 11.2 Linear system
26 Annex A (informative) Example of numerical results
28 Bibliography

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BSI PD ISO/TS 13725:2021
$142.49